AD7797: 24位、低功耗、用于桥式传感器的Σ-Δ型ADC
AD7797是一款适合电子秤等高精度桥式传感器应用的完整模拟前端,内置一个24位分辨率Σ-Δ型ADC。片内仪表放大器具有128的固定增益,因此可直接输入来自桥式传感器等的小信号。AD7797具有一个差分输入,还集成了一个温度传感器,与内部ADC直接相连,此温度传感器可用于电桥的温度补偿。AD7797 器件可以采用内部时钟工作,或者也可采用外部时钟工作,输出数据速率可通过软件编程设置,可在4.17 Hz至123 Hz的范围内变化。AD7797器件采用2.7 V至5.25 V电源供电,典型功耗为250 uA,采用16引脚TSSOP封装。
The AD7797 is a complete analog front end for high precision bridge sensor applications such as weighscales. The AD7797 contains a ∑- ADC capable of 24-bit resolution. The on-chip instrumentation amplifier has a fixed gain of 128 so signals of small amplitude such as those from bridge sensors can be interfaced directly to the ADC.
The part has one differential input. The device also contains a temperature sensor which is internally connected to the ADC. This temperature sensor can be used to perform temperature compensation of the bridge.
The device can be operated with the internal clock, or alternatively, an external clock can be used. The output data rate from the parts is software-programmable and can be varied from 4.17 Hz to 123 Hz.The part operates with a power supply from 2.7 V to 5.25 V. It consumes a current of 250 uA typical and is housed in a 16-lead TSSOP package.
AD7797 特点
- 均方根（RMS）噪声：65 nV
- 仪表放大器
- 温度传感器
- 内部时钟振荡器
- 50 Hz/60 Hz同时抑制
- 更新速率：4.17 Hz至123 Hz
- 功耗：250 uA（典型值）
- 省电模式：1 uA
- 电源电压：2.7 V至5.25 V
- 温度范围：–40°C至+85°C
- 独立接口电源
- 16引脚TSSOP封装
AD7797 技术指标
- Resolution (Bits): 24bit
- # Chan: 1
- Sample Rate: n/a
- Interface: Ser,SPI
- Analog Input Type: Diff-Bip,Diff-Uni
- Ain Range: ± (Vref/128)
- ADC Architecture: Sigma-Delta
- Pkg Type: SOP
AD7797 应用
- 电子秤
- 应变计
- 工业过程控制
- 仪器仪表
- 便携式仪器仪表
- Weighscales
- Strain Gauges
- Industrial Process Control
- Instrumentation
- Portable instrumentation
AD7797 功能框图
AD7797 产品选型
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| AD7797BRUZ | Prodn | 16 ld TSSOP | 16 | 工业 |
| AD7797BRUZ-REEL | Prodn | 16 ld TSSOP | 16 | 工业 |
| EVAL-AD7797EBZ | Prodn | EVALUATION BOARDS | - | 待定 |